Printing All Nodes In A Xml File?

looping thru all the nodes.

I am consuming a rest webservice and printing all the details coming from that service.

see my code below

pageload
authenticate("webservicestring");
authenticate(string uri)

after the credentials

using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
XmlReader responseReader = XmlReader.Create(response.GetResponseStream());
responseReader.Read();
XmlDocument doc = new XmlDocument();
doc.Load(responseReader);
//XmlNodeList firsts = doc.GetElementsByTagName("FNAME");
//XmlNodeList Posts = doc.GetElementsByTagName("Lname");...........